diff --git a/gn/flutter_defines.gni b/gn/flutter_defines.gni
index 0be4820d85cf2..c66de21c5879b 100644
--- a/gn/flutter_defines.gni
+++ b/gn/flutter_defines.gni
@@ -4,7 +4,6 @@
 # found in the LICENSE file.
 flutter_defines = [
   "SK_DISABLE_EXPLICIT_GPU_RESOURCE_ALLOCATION",
-  "SK_LEGACY_SKCODEC_NONE_ENUM",
 
   # Flutter always wants this https://github.com/flutter/flutter/issues/11402
   "SK_ENABLE_DUMP_GPU",
diff --git a/include/codec/SkCodec.h b/include/codec/SkCodec.h
index 623a35fe1c914..fc58db942d6b5 100644
--- a/include/codec/SkCodec.h
+++ b/include/codec/SkCodec.h
@@ -594,11 +594,6 @@ class SK_API SkCodec : SkNoncopyable {
     //   is residing in dst's memory.
     static constexpr int kNoFrame = -1;
 
-    // This transitional definition was added in August 2018, and will eventually be removed.
-#ifdef SK_LEGACY_SKCODEC_NONE_ENUM
-    static constexpr int kNone = kNoFrame;
-#endif
-
     /**
      *  Information about individual frames in a multi-framed image.
      */